The slave ship Mary departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Saint Vincent and the Grenadines.

Vessel: Mary; flag: Great Britain; rig: Brig; estimated standardized tonnage: 115. People recorded in connection with the voyage: Captain: Fisher, Ralph; Investor: Fisher, Ralph; Investor: Kewley; Investor: Kewley, Patrick; Investor: Aspinall, William; Captain: Forrest, James; Investor: Forrest, James; Captain: Harold, Thomas; Investor: Harold, Thomas. The voyage began at Liverpool on 11 March 1791. Principal recorded place where captives were acquired: Bight of Benin, place unspecified. Principal recorded disembarkation place: St Vincent, port unspecified. Recorded outcome: Voyage completed as intended.